Fig. 17.

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Selected PARSEC/COLIBRI solar-metallicity isochrones illustrating the coverage of isochrones by the XSL DR3. The locations of the tip of the RGB for the 1 Gyr and 10 Gyr isochrones are indicated with horizontal black lines. We have employed the colour-temperature relations used in this study to add the giants to this figure to illustrate how well the cool RGB and AGB stars are represented (at arbitrary log g values). Because luminous cool stars are particularly important contributors to the red and NIR light of galaxies, XSL was designed to contain a large number of such objects. We are limited by the lack of hot stars and as such cannot create XSL SSP models younger than 50 Myr.
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